linux-kernel - [PATCH] LoongArch: Correct the definition of is_branch

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Date:   Wed, 14 Dec 2022 16:30:59 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] LoongArch: Correct the definition of is_branch_ins()

The current definition of is_branch_ins() is not correct, it was
first introduced in commit 49aef111e2da ("LoongArch: Add prologue
unwinder support"), in fact, there exist three branch instruction
formats rather than only reg1i21_format.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 arch/loongarch/include/asm/inst.h | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index c00e151..42be39be 100644
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -329,8 +329,31 @@ static inline bool is_pc_ins(union loongarch_instruction *ip)
 
 static inline bool is_branch_ins(union loongarch_instruction *ip)
 {
-	return ip->reg1i21_format.opcode >= beqz_op &&
-		ip->reg1i21_format.opcode <= bgeu_op;
+	switch (ip->reg0i26_format.opcode) {
+	case b_op:
+	case bl_op:
+		return true;
+	}
+
+	switch (ip->reg1i21_format.opcode) {
+	case beqz_op:
+	case bnez_op:
+	case bceqz_op:
+		return true;
+	}
+
+	switch (ip->reg2i16_format.opcode) {
+	case jirl_op:
+	case beq_op:
+	case bne_op:
+	case blt_op:
+	case bge_op:
+	case bltu_op:
+	case bgeu_op:
+		return true;
+	}
+
+	return false;
 }
 
 static inline bool is_ra_save_ins(union loongarch_instruction *ip)
-- 
2.1.0